DRAWING ANGLES WITH SET SQUARES
V. Ryan © 2008
Set squares are used in conjunction with Tsquares to draw accurate angles. There are two main types of set square. One has an angle of 45 degrees and the other 30/60 degree angles. 

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The 45 degree set square also has a 90 degree angle. This can be used for drawing vertical lines. 
The 30/60 degree set square also has a 90 degree angle. This set square can be used to draw 30, 60 or 90 degrees angles. 

Set squares are only accurate if they are used along with a Tsquare. The set square must rest on the Tsquare which should be pushed against the edge of the board. If the Tsquare is not right against the edge of the board (if there are even small gaps) lines drawn at an angle will not be accurate. 

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Common errors when using Tsquares and set squares are that gaps are allowed to develop between the Tsquare and the edge of the board or the set square and the Tsquare. This leads to inaccurate drawing with angles being incorrect. 

Set up a piece of A4 paper on a drawing board using a Tsquare to ensure the paper positioned correctly. Use clips to fix the paper to the board. Draw a border and title block with the title being 30 DEGREES ANGLES. Place the title at the top of the page as well, in larger BLOCK CAPITALS. 

Draw a number of lines at 30 degrees and then ‘flip’ the set square round to draw 30 degree lines in the opposite direction. 

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Draw a number of lines at 60 degrees and then ‘flip’ the set square round to draw 60 degree lines in the opposite direction. 

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Adjustable set squares allow a range of angles to be drawn accurately. They can be adjusted to a variety of angles which means only one set square is required. It must still be used by resting accurately on a Tsquare. 

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